WO2014098210A1 - アポトーシス誘導剤 - Google Patents
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- WO2014098210A1 WO2014098210A1 PCT/JP2013/084225 JP2013084225W WO2014098210A1 WO 2014098210 A1 WO2014098210 A1 WO 2014098210A1 JP 2013084225 W JP2013084225 W JP 2013084225W WO 2014098210 A1 WO2014098210 A1 WO 2014098210A1
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- C12Y205/01—Transferases transferring alkyl or aryl groups, other than methyl groups (2.5) transferring alkyl or aryl groups, other than methyl groups (2.5.1)
- C12Y205/01018—Glutathione transferase (2.5.1.18)
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- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
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- A61K31/7105—Natural ribonucleic acids, i.e. containing only riboses attached to adenine, guanine, cytosine or uracil and having 3'-5' phosphodiester links
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- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
- C12N15/1137—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing against enzymes
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- C12N2310/00—Structure or type of the nucleic acid
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Definitions
- the present invention relates to a novel apoptosis inducer, cell growth inhibitor, autophagy inhibitor, pharmaceutical composition comprising the apoptosis inducer, cell growth inhibitor or autophagy inhibitor, and abnormality of apoptosis, cell proliferation or autophagy
- the present invention relates to a novel treatment method for diseases associated with the disease.
- Cancer is one of the most important and troublesome diseases faced by centuries, and great research efforts are being made to treat it. Cancer is a disease in which cells grow uncontrolled due to gene mutation or epigenetic abnormality. Many gene abnormalities in cancer have already been reported (for example, Non-Patent Document 1 etc.), and many of them are considered to have some relationship with signal transduction related to cell proliferation, differentiation, and survival. It has been. In addition, such gene abnormalities cause abnormal signal transduction in cells composed of normal molecules, which leads to activation and inactivation of specific signal cascades, ultimately causing abnormal cell growth. It may be a factor. Early cancer treatments focused on the suppression of cell growth itself, but such treatments also suppressed the growth of physiologically normal cells, leading to hair loss, digestive disorders, and bone marrow suppression. It was accompanied by side effects such as. Therefore, in order to suppress such side effects, development of cancer therapeutic drugs based on new ideas such as molecular target drugs targeting cancer-specific gene abnormalities and signal transduction abnormalities is underway.
- GST- ⁇ also called glutathioneathS-transferase pi, GSTP1
- GSTP1 glutathioneathS-transferase pi
- Non-patent document 5 a recent report reports that when an androgen-independent prostate cancer cell line overexpressing GST- ⁇ is allowed to act on siRNA for GST- ⁇ , its growth is suppressed and apoptosis is increased.
- Non-patent document 6 it has been reported that when siRNA against GST- ⁇ is allowed to act on cancer cell lines having mutations in KRAS, Akt activation is suppressed and autophagy is increased, but apoptosis is moderately induced.
- An object of the present invention is to provide a composition for effectively inducing apoptosis and / or growth inhibition in cells and a method using the same.
- the present invention relates to the following.
- An agent for inducing apoptosis comprising a drug that suppresses GST- ⁇ and a drug that suppresses Akt as active ingredients.
- An agent for inhibiting cell proliferation comprising a drug that suppresses GST- ⁇ and a drug that suppresses Akt as active ingredients.
- An agent for suppressing autophagy in a cell in which GST- ⁇ is suppressed comprising as an active ingredient a drug that suppresses Akt.
- An agent for enhancing apoptosis induction and / or cell growth inhibition by a drug that suppresses GST- ⁇ comprising an agent that suppresses Akt as an active ingredient.
- a pharmaceutical composition comprising the agent according to any one of (1) to (5).
- the pharmaceutical composition according to (6) which is for cancer treatment.
- the apoptosis-inducing agent of the present invention is extremely useful as a pharmaceutical composition because it can induce apoptosis more effectively than conventional ones and suppress cell proliferation.
- cancer cells can be killed by apoptosis, so that not only the progression of cancer can be prevented, but also the effect of regression of cancer can be expected.
- FIG. 1 is a graph showing the cell growth inhibitory effect of GST- ⁇ or Akt knockdown in PANC-1 cells.
- FIG. 2 is a graph showing the effect of suppressing cell proliferation by knockdown of GST- ⁇ or Akt in A549 cells.
- FIG. 3 is a graph showing the cell growth inhibitory effect of GST- ⁇ and Akt double knockdown in PANC-1 cells.
- FIG. 4 is a graph showing the cell growth inhibitory effect by double knockdown of GST- ⁇ and Akt in A549 cells.
- FIG. 5 is a graph showing the cell growth inhibitory effect of the combined use of GST- ⁇ siRNA and an Akt inhibitor. * P ⁇ 0.05, ** P ⁇ 0.01.
- FIG. 6 is a graph showing the effect of suppressing autophagy by double knockdown of GST- ⁇ and Akt.
- the present invention relates to an agent or composition for suppressing cell growth (hereinafter referred to as “cell growth inhibitor” or “cell growth inhibitor”) comprising, as active ingredients, a drug that suppresses GST- ⁇ and a drug that suppresses Akt. And an agent or composition for inducing apoptosis (hereinafter also referred to as “apoptosis-inducing agent” or “apoptosis-inducing composition”).
- apoptosis-inducing agent hereinafter also referred to as “apoptosis-inducing agent” or “apoptosis-inducing composition”.
- GST- ⁇ refers to an enzyme that catalyzes glutathione conjugation encoded by the GSTP1 gene.
- GST- ⁇ exists in various animals including humans, and its sequence information is also known (for example, human: NP_000843 (NM_000852), rat: NP_036709 (NM_012577), mouse: NP_038569 (NM_013541), etc.)
- the numbers are NCBI databases. The accession number is shown, the amino acid sequence outside the parentheses, and the base sequence number inside the parentheses).
- Akt refers to a serine / threonine kinase having a PH domain encoded by the Akt gene.
- Akt has three types of isotopes known as Akt1 to Akt3, but since Akt1 is associated with the PI3K / AKT / mTOR pathway, Akt refers to Akt1 unless otherwise specified in this specification.
- Shall. Akt exists in various animals including humans, and its sequence information is also known (for example, human: NP_005154 (NM_005163) etc. The number indicates the accession number of the NCBI database. It is the number of the base sequence).
- the GST- ⁇ or GSTP1 gene, or the Akt or Akt gene in the present invention is a It is not limited to proteins and nucleic acids having the same sequence, but one or more, typically one or several, for example 1, 2, 3, 4, 5 for the same sequence , 6, 7, 8, 9 or 10 amino acids or bases, but may have a function equivalent to that of the known GST- ⁇ or Akt described above. Specific functions of GST- ⁇ and Akt are as described later.
- the “drug that suppresses GST- ⁇ ” used in the present specification is not limited, but includes, for example, a drug that suppresses production and / or activity of GST- ⁇ , and degradation and / or inactivation of GST- ⁇ .
- Drugs that promote Examples of drugs that suppress GST- ⁇ production include, but are not limited to, RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimeric polynucleotides for DNA encoding GST- ⁇ , and these. A vector etc. are mentioned.
- drugs that suppress GST- ⁇ activity include, but are not limited to, for example, substances that bind to GST- ⁇ , such as glutathione, glutathione analogs (eg, WO 95/08563, WO 96/40205, WO 99/54346, as described in Non-Patent Document 4, etc.), ketoprofen (Non-Patent Document 2), indomethacin (Hall et al., Cancer Res. 1989; 49 (22): 6265-8), ethacrynic acid, pyroprost (Tew et al., Cancer Res. 1988; 48 (13): 3622-5), anti-GST- ⁇ antibodies, dominant negative mutants of GST- ⁇ , and the like. These drugs are commercially available or can be appropriately produced based on known techniques.
- substances that bind to GST- ⁇ such as glutathione, glutathione analogs (eg, WO 95/08563, WO 96/40205, WO 99/54346, as described in Non-Patent
- Drugs that suppress GST- ⁇ production or activity include RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimeras for DNA encoding GST- ⁇ due to its high specificity and low possibility of side effects. Polynucleotides and vectors expressing them are preferred.
- the inhibition of GST- ⁇ can be determined by the fact that the expression and activity of GST- ⁇ are suppressed in the cells as compared with the case where no GST- ⁇ inhibitor was allowed to act.
- the expression of GST- ⁇ is not limited to any known method, for example, immunoprecipitation using an anti-GST- ⁇ antibody, EIA, ELISA, IRA, IRMA, Western blotting, immunohistochemistry, immunization Cytochemistry, flow cytometry, various nucleic acids using nucleic acids that specifically hybridize to a nucleic acid encoding GST- ⁇ or a unique fragment thereof or a transcription product (eg, mRNA) or splicing product of the nucleic acid. It can be evaluated by a hybridization method, Northern blot method, Southern blot method, various PCR methods and the like.
- the activity of GST- ⁇ is not limited to the known activity of GST- ⁇ .
- it binds to proteins such as Raf-1 (particularly phosphorylated Raf-1) and EGFR (particularly phosphorylated EGFR).
- the sex and the like can be evaluated by analyzing by any known method such as immunoprecipitation, Western blotting, mass spectrometry, pull-down, surface plasmon resonance (SPR), and the like.
- a drug that suppresses Akt is not limited and includes, for example, a drug that suppresses production and / or activity of Akt, a drug that promotes degradation and / or inactivation of Akt, and the like. included.
- examples of drugs that suppress Akt production include, but are not limited to, RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimera polynucleotides, and vectors expressing them, for Akt-encoding DNA. It is done.
- Examples of the drug that suppresses the activity of Akt include, but are not limited to, a substance that binds to Akt, such as Akt Inhibitor (Akt Inhibitor, Akt Inhibitor II to XIII) of Merck Millipore, MK-2206, Perifosine, GSK690693, AT7867, CCT128930, PHT-427, Palomid 529, PF-04691502, Tricibin, Triciribine phosphate (NSC-280594), A-674563, sc-221226, anti-Akt antibody, dominant negative mutant of Akt, etc. Can be mentioned. These drugs are commercially available or can be appropriately produced based on known techniques.
- Akt Inhibitor Akt Inhibitor, Akt Inhibitor II to XIII
- Merck Millipore MK-2206
- Perifosine GSK690693
- AT7867 CCT128930
- PHT-427 Palomid 529
- Drugs that suppress Akt production or activity include RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimeric polynucleotides and DNA / RNA chimeric polynucleotides for Akt-encoding DNA because of their high specificity and low possibility of side effects.
- a vector that expresses is preferred.
- the suppression of Akt can be determined by the fact that the expression and activity of Akt are suppressed in the cells compared to the case where no Akt inhibitor was allowed to act.
- the expression of Akt is not limited to any known method, for example, immunoprecipitation using an anti-Akt antibody, EIA, ELISA, IRA, IRMA, Western blotting, immunohistochemistry, immunocytochemistry, Various hybridization methods, Northern blotting methods using nucleic acids that specifically hybridize to nucleic acids that specifically encode Akt-encoding nucleic acids or unique fragments, or transcription products (eg, mRNA) or splicing products of the nucleic acids , Southern blotting, various PCR methods and the like.
- the activity of Akt is not limited to the known activity of Akt.
- the binding activity to a protein such as mTOR can be determined by any known method such as immunoprecipitation, western blotting, and mass spectrometry. It can be evaluated by analyzing by a pull-down method, surface plasmon resonance (SPR) method or the like.
- an RNAi molecule refers to any molecule that causes RNA interference, including, but not limited to, siRNA (small interfering RNA), miRNA (micro RNA), shRNA (short hairpin RNA), ddRNA (DNA- directed RNA), piRNA (Piwi-interacting RNA), rasiRNA (repeat associated siRNA) and the like, and variants thereof.
- siRNA small interfering RNA
- miRNA miRNA
- shRNA short hairpin RNA
- ddRNA DNA- directed RNA
- piRNA piRNA
- rasiRNA replicaat associated siRNA
- antisense nucleic acid includes RNA, DNA, PNA, or a complex thereof.
- a DNA / RNA chimeric polynucleotide is not limited, for example, a double-stranded polynucleotide comprising DNA and RNA that inhibits expression of a target gene described in JP-A-2003-219893. Including.
- the drug that suppresses GST- ⁇ and the drug that suppresses Akt may be included in a single preparation, or may be included separately in two or more preparations. In the latter case, each preparation may be administered at the same time or may be administered at intervals. When administered at a time interval, a preparation containing a drug that suppresses GST- ⁇ may be administered before or after a preparation containing a drug that suppresses Akt.
- the present invention also provides an agent or composition (hereinafter referred to as “apoptosis induction enhancement”) for enhancing apoptosis induction and / or cell growth inhibition by a drug that inhibits GST- ⁇ , which contains an agent that inhibits Akt as an active ingredient.
- the compounding amount of the active ingredient in the agent or composition of the present invention may be an amount that induces apoptosis and / or suppresses cell proliferation when the agent or composition is administered. In addition, an amount that does not cause adverse effects exceeding the benefits of administration is preferred. Such an amount is known or can be appropriately determined by an in vitro test using cultured cells, or a test in a model animal such as a mouse, rat, dog or pig. Such a test method is well known to those skilled in the art. Are known.
- Induction of apoptosis is evaluated by various known techniques such as DNA fragmentation, annexin V binding to the cell membrane, changes in mitochondrial membrane potential, caspase activation, and other phenomena peculiar to apoptosis, and TUNEL staining. can do.
- suppression of cell proliferation can be performed by various known methods such as counting the number of living cells over time, measuring tumor size, volume or weight, measuring DNA synthesis, WST-1 method, BrdU (bromodeoxy). (Uridine) method, 3 H thymidine incorporation method, and the like.
- the amount of the active ingredient may vary depending on the dosage form of the agent or the composition.
- the amount of the active ingredient blended in one unit of the composition may be a plurality of the amount of the active ingredient necessary for one administration. it can. Those skilled in the art can appropriately adjust the blending amount.
- the present invention also provides a method for producing an agent or a composition for inducing apoptosis or suppressing cell proliferation, comprising combining a drug that suppresses GST- ⁇ and a drug that suppresses Akt as active ingredients , Use of a drug that suppresses GST- ⁇ and a drug that suppresses Akt in the production of an agent or composition for inducing apoptosis or suppressing cell proliferation, GST used for inducing apoptosis or suppressing cell proliferation, A combination of a drug that inhibits - ⁇ and a drug that inhibits Akt, as well as administering an effective amount of a drug that inhibits GST- ⁇ and a drug that inhibits Akt, or induces apoptosis or inhibits cell proliferation On how to do.
- the present invention also produces an agent or composition for enhancing apoptosis induction and / or cell growth inhibition by a GST- ⁇ -inhibiting drug, which comprises incorporating an Akt-inhibiting drug as an active ingredient Method, use of a drug that suppresses Akt, in the production of an agent or a composition for enhancing apoptosis induction and / or suppression of cell proliferation by a drug that suppresses GST- ⁇ , by a drug that suppresses GST- ⁇ Induction of apoptosis by a drug that inhibits GST- ⁇ , comprising administering an agent that inhibits Akt used to enhance apoptosis induction and / or inhibition of cell proliferation, and an effective amount of an agent that inhibits Akt And / or to a method of enhancing inhibition of cell proliferation.
- each drug can be performed according to any known technique. Any of the above-described methods for inducing apoptosis or suppressing cell growth may be an in vitro method or an in vivo method. Further, the drug in the method is as described above, and the effective amount of the drug may be an amount that induces apoptosis or suppresses cell proliferation in the administered cell. In addition, an amount that does not cause adverse effects exceeding the benefits of administration is preferred. Such an amount is known or can be appropriately determined by an in vitro test using cultured cells or the like, and such a test method is well known to those skilled in the art.
- the effective amount need not necessarily result in apoptosis or growth inhibition in all cells of the cell population when the drug is administered to the cell population.
- the effective amount is 1% or more, 2% or more, 3% or more, 4% or more, 5% or more, 6% or more, 8% or more, 10% or more, 12% or more, 15% of the cells in the cell population.
- the amount may bring about apoptosis or growth inhibition to 20% or more, further 25% or more.
- the agent for inducing apoptosis and inhibiting cell growth of the present invention can effectively induce apoptosis or growth inhibition even in cells having abnormal cell proliferation, and is effective as a component of a pharmaceutical composition.
- one aspect of the present invention includes a pharmaceutical composition comprising the apoptosis-inducing agent or cytostatic agent of the present invention.
- the pharmaceutical composition of the present invention is particularly effective for treating diseases having abnormalities in apoptosis. Therefore, one embodiment of the present invention relates to a pharmaceutical composition for treating a disease having an abnormality in apoptosis, comprising the apoptosis inducer.
- a disease having an abnormality in apoptosis is not limited thereto. For example, a disease caused by abnormal cell proliferation, a disease caused by KRAS mutation, or an overexpression of GST- ⁇ . Disease to be included.
- Diseases resulting from abnormal cell proliferation include, but are not limited to, for example, benign or malignant tumors, hyperplasia, keloids, Cushing syndrome, primary aldosteronism, erythema, polycythemia vera, leukoplakia, hyperplasia. Includes formed scars, lichen planus and melanosis.
- KRAS mutation examples include, but are not limited to, benign or malignant tumor (also referred to as cancer or malignant neoplasm).
- GST- ⁇ Diseases resulting from overexpression of GST- ⁇ include, but are not limited to, for example, benign or malignant tumors, particularly drug resistance (eg, alkylating agents such as melphalan and cyclophosphamide, anthracyclines such as adriamycin Antitumor antibiotics, platinum complexes such as cisplatin, and malignant tumors resistant to etoposide).
- drug resistance eg, alkylating agents such as melphalan and cyclophosphamide, anthracyclines such as adriamycin Antitumor antibiotics, platinum complexes such as cisplatin, and malignant tumors resistant to etoposide.
- the disease having an abnormality in apoptosis is cancer.
- the cancer in the present invention is not limited, for example, fibrosarcoma, malignant fibrous histiocytoma, liposarcoma, rhabdomyosarcoma, leiomyosarcoma, angiosarcoma, Kaposi sarcoma, lymphangiosarcoma, synovial sarcoma , Sarcomas such as chondrosarcoma, osteosarcoma, brain tumor, head and neck cancer, breast cancer, lung cancer, esophageal cancer, stomach cancer, duodenal cancer, appendix cancer, colon cancer, rectal cancer, liver cancer, pancreatic cancer, gallbladder cancer, bile duct cancer, anal cancer, Examples include renal cancer, ureteral cancer, bladder cancer, prostate cancer, penile cancer, testicular cancer, uterine cancer, ovarian cancer, vulvar cancer, vaginal cancer, skin cancer and other carcinomas, as well as leukemia and malignant lymphoma.
- cancer includes epithelial malignant tumors and non-epithelial malignant tumors.
- the cancer in the present invention may be any part of the body, for example, brain, head and neck, chest, limbs, lung, heart, thymus, esophagus, stomach, small intestine (duodenum, jejunum, ileum), large intestine (colon, cecum, appendix).
- liver pancreas, gallbladder, anus, kidney, ureter, bladder, prostate, penis, testis, uterus, ovary, vulva, vagina, skin, striated muscle, smooth muscle, synovium, cartilage, bone, thyroid , Adrenal glands, peritoneum, mesentery, bone marrow, blood, vascular system, lymph nodes such as lymph nodes, lymph fluid, etc.
- the cancer includes cancer cells having the mutant KRAS defined above.
- the cancer comprises cancer cells that exhibit hormone or growth factor independent proliferation.
- the cancer comprises cancer cells that exhibit GST- ⁇ overexpression.
- the cancer is drug resistant.
- the cancer is selected from the group consisting of alkylating agents such as melphalan and cyclophosphamide, anthracycline antitumor antibiotics such as adriamycin, platinum complexes such as cisplatin, and etoposide. Resistant to drugs.
- the cancer is resistant to a drug selected from the group consisting of melphalan, cyclophosphamide, adriamycin, cisplatin, etoposide.
- the present invention also provides a pharmaceutical composition for treating a disease having an abnormality in apoptosis, comprising a drug that suppresses GST- ⁇ and a drug that suppresses Akt as an active ingredient, a drug that suppresses GST- ⁇ , and an inhibitor that suppresses Akt
- a method for producing a pharmaceutical composition for treating a disease having an abnormality in apoptosis comprising combining a drug to be treated as an active ingredient, a disease having an abnormality in apoptosis of a drug that suppresses GST- ⁇ and a drug that suppresses Akt , A combination of a drug that suppresses GST- ⁇ and a drug that suppresses Akt, and an effective amount of the pharmaceutical composition used for the manufacture of a pharmaceutical composition that treats
- For treating a disease having an abnormality in apoptosis comprising administering to a subject in need thereof.
- the apoptosis inducer, cell growth inhibitor and composition containing the same of the present invention may be used in combination with other active ingredients.
- the combined use includes, for example, administering other active ingredients as separate preparations, and administering the other active ingredients as a combination with at least one other drug.
- preparations containing other active ingredients may be administered before other preparations, simultaneously with other preparations, or after other preparations.
- Such other active ingredients include those that are effective in treating the target disease.
- an anticancer agent can be used in combination.
- anticancer agents include, for example, alkylating agents such as ifosfamide, nimustine hydrochloride, cyclophosphamide, dacarbazine, melphalan, ranimustine, gemcitabine hydrochloride, enocitabine, cytarabine ocphosphat, cytarabine formulation, tegafur uracil, tegafur Gimeracil / oteracil potassium combination drug (eg TS-1), antimetabolite such as doxyfluridine, hydroxycarbamide, fluorouracil, methotrexate, mercaptopurine, idarubicin hydrochloride, epirubicin hydrochloride, daunorubicin hydrochloride, daunorubicin citrate, doxorubicin hydrochloride,
- platinum complexes such as carboplatin, cisplatin (CDDP) and nedaplatin
- angiogenesis inhibitors such as thalidomide, neobasstat and bevacizumab, and L-asparaginase.
- autophagy can include macroautophagy, microautophagy, chaperone-mediated autophagy, etc., but typically means macroautophagy. Accordingly, the term “autophagy” in the present invention refers to “macroautophagy” unless otherwise specified.
- Autophagy is one of intracellular protein degradation mechanisms called “autophagy” and is responsible for the degradation and recycling of proteins in cells. Autophagy is found in a wide range of species, including yeast and mammals, and is generally (a) formation of PAS (phagophore assembly site), (b) extension and expansion of a phagophore (isolation membrane) surrounding the protein to be degraded. This involves a series of processes including the formation of autophagosomes encapsulating the protein to be degraded, (c) the formation of autolysosomes by fusion of autophagosomes and lysosomes, and (d) the degradation of proteins within the autolysosomes. .
- Examples of autophagy-related factors involved in the core molecular mechanism of autophagy in mammals include VMP1, TP53INP2, mAtg9, ULK complex (consisting of ULK1, ULK2, mAtg13, and FIP200) involved in the formation of PAS, PI3K complex Body (Atg14L complex composed of Beclin1, hVps34, p150, Ambra1, Atg14L, and UVRAG complex composed of Beclin1, hVps34, p150, Bif-1, UVRAG), LC3-II involved in phagophore elongation , Atg12-Atg5-Atg16L complex, and the like.
- the drugs that suppress autophagy are not limited, and include, for example, autophagy-related factors including those described above (in the case where the related factor is a complex, not only the complex itself but also the individual composing the complex). And the like, and drugs that promote the degradation and / or inactivation of autophagy-related factors.
- drugs that suppress the production of autophagy-related factors include RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimeric polynucleotides, and vectors that express these, against DNA encoding autophagy-related factors.
- drugs that suppress the activity of autophagy-related factors include, but are not limited to, for example, inhibitors of PI3K (eg, wortmannin), particularly inhibitors of class III PI3K (eg, 3-MA (3- Methyl adenine)), substances that inhibit autophagosome-lysosome fusion (eg, bafilomycin A1), substances that inhibit proteolysis in autolysosomes (eg, chloroquine, leupeptin, etc.), autophagy-related factors Examples include substances that bind (for example, antibodies to autophagy-related factors), dominant negative mutants of autophagy-related factors, and the like. These drugs are commercially available or can be appropriately produced based on known techniques.
- inhibitors of PI3K eg, wortmannin
- class III PI3K eg, 3-MA (3- Methyl adenine
- substances that inhibit autophagosome-lysosome fusion eg, bafilomycin A1
- RNAi molecules As a drug that suppresses autophagy, RNAi molecules, ribozymes, antisense nucleic acids, DNA / RNA chimera polynucleotides for DNA encoding autophagy-related factors and these are expressed because of their high specificity and low side effects.
- Vectors are preferred.
- the suppression of autophagy can be determined by the suppression of autophagy in the cells compared to the case where the autophagy inhibitor of the present invention is not allowed to act.
- Suppression of autophagy is not limited to any known method, for example, detection of autophagosomes by electron microscopy, detection of autophagy markers (eg, Atg5, Atg12, LC3, especially LC3-II, etc.), etc. Can be evaluated on the basis.
- LC3-II is not limited, and may be detected with, for example, a specific antibody against LC3-II, or LC3-II separated into a band different from LC3-I after separation of the sample by electrophoresis or the like.
- LC3-II can also be detected by Western blotting using an antibody that reacts with LC3-II or both LC3-I and LC3-II.
- LC3-I is scattered in the cytoplasm
- LC3-II is localized in a structure unique to autophagy such as an isolating membrane, autophagosome, autolysosome, and the like.
- the presence or number of punctate signals showing these structures which are manifested by immunostaining with an antibody that reacts with both LC3-II) or the like, may be used as an index of autophagy.
- the present invention also provides an agent or composition for suppressing autophagy in a GST- ⁇ -suppressed cell (“autophagy inhibitor” or “autophagy inhibitory composition”, comprising a drug that suppresses Akt as an active ingredient) ").
- autophagy inhibitor or “autophagy inhibitory composition”, comprising a drug that suppresses Akt as an active ingredient”
- the suppression of autophagy can be determined by the suppression of autophagy in cells compared to the case where the agent or composition of the present invention is not allowed to act.
- the autophagy evaluation method is as described above.
- “GST- ⁇ is suppressed” includes, for example, a state where GST- ⁇ is suppressed in a cell in which GST- ⁇ is expressed.
- Such a state examples include a state in which a GST- ⁇ -expressing drug (for example, those described above) is administered to cells expressing GST- ⁇ . Whether or not GST- ⁇ is expressed in a certain cell is known in the literature or can be determined by actually detecting the expression of GST- ⁇ in the cell. The expression of GST- ⁇ can be detected using any known technique, including those already described above.
- the present invention further includes a method for producing an agent or a composition for suppressing autophagy in a cell in which GST- ⁇ is suppressed, and a method for preparing GST- Use in the manufacture of an agent or composition for suppressing autophagy in cells in which ⁇ is suppressed, a drug for suppressing Akt used for suppressing autophagy in cells in which GST- ⁇ is suppressed, and an effective amount of Akt
- the present invention also relates to a method for suppressing autophagy in cells in which GST- ⁇ is suppressed, comprising administering a drug that suppresses GST- ⁇ .
- the agent or composition for suppressing autophagy according to the present invention is useful for treatment of a condition associated with the enhancement of autophagy in a situation where GST- ⁇ is suppressed.
- a state include, but are not limited to, a state in which the expression and activity of GST- ⁇ are reduced, and a state in which a drug that suppresses the expression and activity of GST- ⁇ is administered.
- the present invention also provides a pharmaceutical composition for treating a condition associated with enhanced autophagy in a situation where GST- ⁇ is suppressed, comprising a drug that suppresses Akt as an active ingredient, and a drug that suppresses Akt.
- a method for producing a pharmaceutical composition for treating a state associated with enhancement of autophagy in a situation where GST- ⁇ is suppressed including a step of blending, a situation where GST- ⁇ of a drug that suppresses Akt is suppressed
- administering an effective amount of a drug that suppresses Akt to a subject in need thereof under conditions where GST- ⁇ is suppressed It also relates to a method of treating a condition associated with increased fuzzy.
- the compounding amount of the active ingredient in the agent or composition of the present invention relating to suppression of autophagy may be an amount that achieves suppression of autophagy when the agent or composition is administered. In addition, an amount that does not cause adverse effects exceeding the benefits of administration is preferred. Such an amount is known or can be appropriately determined by an in vitro test using cultured cells, or a test in a model animal such as a mouse, rat, dog or pig. Such a test method is well known to those skilled in the art. Are known.
- the suppression of autophagy can be evaluated by various known techniques, including those described above.
- the amount of the active ingredient may vary depending on the dosage form of the agent or the composition.
- the amount of the active ingredient blended in one unit of the composition may be a plurality of the amount of the active ingredient necessary for one administration. it can. Those skilled in the art can appropriately adjust the blending amount.
- the drug and the compounding amount thereof in the production method or use of the above-mentioned agent or composition relating to suppression of autophagy are as described above.
- Formulation of each drug can be performed according to any known technique.
- any of the above methods for suppressing autophagy may be an in-vitro method or an in-vivo method.
- the effective amount of the drug in the above method may be an amount that achieves a desired effect (that is, suppression of autophagy) in the administered cells.
- a desired effect that is, suppression of autophagy
- an amount that does not cause adverse effects exceeding the benefits of administration is preferred.
- Such an amount is known or can be appropriately determined by an in vitro test using cultured cells or the like, and such a test method is well known to those skilled in the art. Achievement of the desired effect can be assessed by various known techniques including those described above.
- the effective amount does not necessarily induce a desired effect on all cells of the cell population when the drug is administered to the cell population.
- the effective amount is 1% or more, 2% or more, 3% or more, 4% or more, 5% or more, 6% or more, 8% or more, 10% or more, 12% or more, 15% of the cells in the cell population.
- the amount may induce a desired effect to 20% or more, further 25% or more.
- the active ingredient in the various agents, compositions, treatment methods, etc. of the present invention described in the present specification is a nucleic acid such as an RNAi molecule, a ribozyme, an antisense nucleic acid, a DNA / RNA chimeric polynucleotide, etc.
- a nucleic acid such as an RNAi molecule, a ribozyme, an antisense nucleic acid, a DNA / RNA chimeric polynucleotide, etc.
- the vector any known vector such as a plasmid vector, a phage vector, a phagemid vector, a cosmid vector, or a virus vector can be used.
- the vector preferably includes at least a promoter that enhances the expression of the nucleic acid carried, and in this case, the nucleic acid is preferably operably linked to such a promoter.
- Nucleic acid operably linked to a promoter means that the nucleic acid and the promoter are arranged so that the protein encoded by the nucleic acid is appropriately produced by the action of the promoter.
- the vector may or may not be replicable in the host cell, and transcription of the gene may be performed outside or inside the nucleus of the host cell. In the latter case, the nucleic acid may be integrated into the genome of the host cell.
- the active ingredient can also be supported on various non-viral lipids or protein carriers.
- examples of such carriers include, but are not limited to, cholesterol, liposomes, antibody protomers, cyclodextrin nanoparticles, fusion peptides, aptamers, biodegradable polylactic acid copolymers, polymers, and the like, and increase the efficiency of incorporation into cells.
- cationic liposomes and polymers for example, polyethyleneimine
- polymers useful as such carriers include those described in US ⁇ ⁇ ⁇ 2008/0207553, US 2008/0312174, and the like.
- the active ingredient may be combined with other optional ingredients as long as the effect of the active ingredient is not hindered.
- optional components include other chemotherapeutic agents, pharmacologically acceptable carriers, excipients, diluents and the like.
- the composition may be coated with an appropriate material such as an enteric coating or a time-disintegrating material. It may be incorporated.
- compositions of the present invention described herein can be produced by various routes including both oral and parenteral, such as, without limitation, oral, intravenous, Intramuscular, subcutaneous, local, intratumoral, rectal, intraarterial, intraportal, intraventricular, transmucosal, transdermal, intranasal, intraperitoneal, intrapulmonary, intrauterine, etc. It may be formulated into a dosage form suitable for the administration route. Any known dosage form and formulation method can be adopted as appropriate (see, for example, Standard Pharmaceutical Sciences, Yoshiaki Watanabe, Nankodo, 2003, etc.).
- dosage forms suitable for oral administration include, but are not limited to, powders, granules, tablets, capsules, solutions, suspensions, emulsions, gels, syrups, etc.
- Suitable dosage forms include injections such as solution injections, suspension injections, emulsion injections, and injections prepared at the time of use.
- Formulations for parenteral administration can be in the form of aqueous or non-aqueous isotonic sterile solutions or suspensions.
- the various agents or compositions (including various pharmaceutical compositions) of the present invention described in the present specification may be targeted to specific tissues or cells. Targeting can be accomplished by any known technique. When intended for delivery to cancer, it is not limited, for example, passive by making the formulation 50 to 200 ⁇ m in diameter suitable for the expression of EPR (enhanced permeability and retention) effect, particularly 75 to 150 ⁇ m. Targeting, CD19, HER2, transferrin receptor, folate receptor, VIP receptor, EGFR (Torchilin, AAPS J.
- RAAG10 (Special Table 2005-532050), PIPA (Special Table 2006-506071), ligands such as KID3 (special table 2007-529197), peptides having RGD motif or NGR motif, F3, LyP-1 (Ruoslahti et al., J Cell Biol. 2010; 188 (6): 759-68) can be used as a targeting agent.
- ligands such as KID3 (special table 2007-529197), peptides having RGD motif or NGR motif, F3, LyP-1 (Ruoslahti et al., J Cell Biol. 2010; 188 (6): 759-68) can be used as a targeting agent.
- carriers containing retinoids as targeting agents can also be used. In addition to the above-mentioned documents, such carriers are described in WO 2009/036368, WO ⁇ ⁇ 2010/014117, WO ⁇ ⁇ 2012/170952, and the like.
- compositions of the present invention may be supplied in any form, but from the viewpoint of storage stability, for example, a form that can be prepared at the time of use, for example, Alternatively, it may be provided in a form that can be prepared by a doctor and / or pharmacist, nurse, or other paramedical at or near a medical site. Such a form is particularly useful when the agent or composition of the present invention contains components that are difficult to stably store, such as lipids, proteins, and nucleic acids.
- the agent or composition of the present invention is provided as one or more containers containing at least one of the essential components thereof and is used before use, for example within 24 hours, preferably 3 Prepared within an hour and more preferably immediately before use.
- reagents, solvents, dispensing devices and the like that are usually available at the place of preparation can be appropriately used.
- the present invention provides a preparation kit for a composition
- a preparation kit for a composition comprising one or more containers containing active ingredients that can be contained in the various agents or compositions of the present invention alone or in combination, and such a kit.
- the necessary components of various agents or compositions provided in the form of may contain instructions describing how to prepare and administer the various agents or compositions of the present invention, such as instructions and electronic recording media such as CDs and DVDs. Good.
- the kit of this invention may contain all the components for completing the various agents or compositions of this invention, it does not necessarily need to contain all the components. Therefore, the kit of the present invention may not contain reagents and solvents that are usually available at medical sites, experimental facilities, etc., such as sterile water, physiological saline, and glucose solution.
- the effective amount in the various treatment methods of the present invention described in the present specification is, for example, an amount that reduces the symptoms of the disease, delays or stops the progression of the disease, and preferably suppresses the disease, or The amount to heal.
- an amount that does not cause adverse effects exceeding the benefits of administration is preferred.
- Such an amount can be appropriately determined by an in vitro test using cultured cells or the like and a test in a model animal such as a mouse, rat, dog or pig, and such a test method is well known to those skilled in the art. .
- the dose of the drug used in the treatment method of the present invention is known to those skilled in the art, or can be appropriately determined by the above-described test or the like.
- Administration routes include various routes including both oral and parenteral, such as oral, intravenous, intramuscular, subcutaneous, topical, intratumoral, rectal, intraarterial, intraportal, intraventricular, transmucosal, Routes such as transdermal, intranasal, intraperitoneal, intrapulmonary and intrauterine are included.
- the frequency of administration varies depending on the properties of the agent and composition used and the conditions of the subject including the above, but for example, many times a day (ie, 2, 3, 4 or 5 times a day), 1 day a day Times, every few days (ie every 2, 3, 4, 5, 6, 7 days, etc.), every week, every few weeks (ie every 2, 3, 4 weeks, etc.).
- the term “subject” means any living individual, preferably an animal, more preferably a mammal, more preferably a human individual.
- a subject may be healthy or suffer from some disease, but when treatment of a specific disease is intended, typically the subject is suffering from such disease.
- treatment as used herein also encompasses all types of medically acceptable prophylactic and / or therapeutic interventions intended to cure, temporarily ameliorate, or prevent disease. Shall.
- the term “treatment” encompasses medically acceptable interventions for various purposes, including delaying or stopping the progression of a disease, regression or disappearance of a lesion, prevention of onset or prevention of recurrence, and the like.
- Example 1 GST- ⁇ and Akt knockdown by siRNA 1 ⁇ 10 6 PANC-1 cells were seeded in a 10 cm dish, and 10% fetal bovine serum (FBS) and 5% L-glutamine were added. And cultured at Roswell Park Memorial Institute 1640 (RPMI 1640, Sigma) for 18 hours. Culture conditions were 37 ° C. and 5% CO 2 unless otherwise specified. Further, 1 ⁇ 10 6 A549 cells were seeded in a 10 cm petri dish and cultured for 18 hours in Dulbecco's modified Eagle's medium (DMEM, Sigma) supplemented with 10% FBS and 10% L-glutamine. Each medium was changed, and 2 hours later, 20-30% confluent PANC-1 or A549 cells were transfected with GST- ⁇ siRNA and / or Akt siRNA using Lipofectamine RNAiMAX (Life Technologies).
- FBS fetal bovine serum
- RPMI 1640 Roswell Park Memorial Institute 1640
- a Lipofectamine / siRNA mixed solution for transfection was prepared as follows. First, a Lipofectamine solution in which 35 ⁇ L of Lipofectamine RNAiMAX and 965 ⁇ L of OPTI-MEM (Sigma) were mixed was prepared. Next, prepare a siRNA solution in which a predetermined amount of 10 ⁇ M siRNA is made up to 1 mL with OPTI-MEM (for example, when preparing a siRNA solution to be used at a final concentration of 30 nM, 36 ⁇ L of 10 ⁇ M siRNA and 964 ⁇ L of OPTI-MEM are used. This was mixed with the above lipofectamine solution and allowed to stand at room temperature for 15 minutes. The following siRNA was used.
- Akt siRNA Akt siRNA I (Cell Signaling Technology, # 6211)
- Control siRNA AllStars Neg. Control siRNA 1027281 (QIAGEN)
- siRNA To optimize the concentration of siRNA, add GST- ⁇ siRNA or Akt siRNA at a final concentration of 10-50 nM to a petri dish containing PANC-1 cells or A549 cells substituted with 10 mL OPTI-MEM and at room temperature for 5 After time culture, the medium was replaced (PANC-1 cells were RPMI 1640 with 5% FBS, and A549 cells were DMEM with 10% FBS) and cultured for 2 hours. As a control, a control siRNA added at a final concentration of 30 nM was used. These cells were detached from a 10 cm petri dish by trypsin treatment, collected, and seeded at 1 ⁇ 10 5 cells in a 6 cm petri dish.
- a Lipofectamine / siRNA mixed solution in which GST- ⁇ siRNA and Akt siRNA were mixed was added to each cell in the same manner as described above. Counted the number.
- a control siRNA added at a final concentration of 30 nM was used.
- the above Lipofectamine / siRNA mixed solution was prepared by mixing 36 ⁇ L of 10 ⁇ M GST- ⁇ siRNA, 36 ⁇ L of 10 ⁇ M Akt siRNA and 928 ⁇ L of OPTI-MEM as the siRNA solution. It was made with. From the results shown in FIGS. 3 and 4, it can be seen that when GST- ⁇ and Akt are both knocked down, the cell growth inhibitory effect is greater than when only one of them is knocked down.
- Example 2 Concomitant use of GST- ⁇ siRNA and an Akt inhibitor Similar results can be obtained using a substance other than siRNA as an Akt inhibitor.
- Akt Inhibitor VIII (Merck # 124018, 1, 3 -Dihydro-1- (1-((4- (6-phenyl-1H-imidazo [4,5-g] quinoxalin-7-yl) phenyl) methyl) -4-piperidinyl) -2H-benzimidazol-2-one ). It is known that Akt Inhibitor VIII binds to the Pleckstrin homology (PH) region of Akt to cause allosteric inhibition and does not inhibit Akt3 but selectively blocks phosphorylation and activation of Akt1 and Akt2.
- Pleckstrin homology PH
- PANC-1 cells were seeded in a 10 cm dish and cultured in RPMI 1640 supplemented with 10% FBS and 5% L-glutamine for 24 hours.
- the medium was replaced with 10 mL of OPTI-MEM, and GST- ⁇ siRNA prepared in the same manner as in Example 1 was added to the petri dish at a final concentration of 50 nM.
- the medium was replaced with RPMI 1640 supplemented with 5% FBS. And cultured for 2 hours.
- Scramble siRNA added at the same concentration was used. Scramble siRNA having the following sequence was used (Hokkaido System Science).
- Sense strand CGAUUCCGCUAGACCGGCUUCAUUGCAG (SEQ ID NO: 3)
- Antisense strand GCAAUGAAGCCCGGUCUAGCGAAUCGAU (SEQ ID NO: 4)
- Example 3 Suppression of autophagy by double knockdown of GST- ⁇ and Akt It was examined how autophagy is affected by double knockdown of GST- ⁇ and Akt.
- 1 ⁇ 10 6 PANC-1 cells were seeded in a 10 cm dish and cultured in RPMI 1640 supplemented with 10% FBS and 5% L-glutamine for 24 hours.
- the medium was replaced with 10 mL of OPTI-MEM, and GST- ⁇ siRNA, Akt siRNA, or a mixed solution of GST- ⁇ siRNA and Akt siRNA prepared in the same manner as in Example 1 was used so that each siRNA had a final concentration of 10 nM.
- the culture medium was replaced with RPMI 1640 supplemented with 5% FBS and cultured for 3 days.
- Lysis buffer is NP-40 Alternative, PROTEIN GRADE ® Detergent, 10% Solution, Sterile-Filtered (CALBIOCHEM) 100 ⁇ L, 1 M Tris-HCl (pH 7.5) 500 ⁇ L, 5 M NaCl 300 ⁇ L, 0.5 M EDTA 20 ⁇ L, sterile water 9 .08 ⁇ L was prepared by mixing.
- the cell lysate was collected with a cell scraper and cooled on ice for 30 minutes. During this time, the mixture was mixed by inversion every 10 minutes.
- the obtained solution was centrifuged at 15000 rpm at 4 ° C. for 15 minutes, and the supernatant was collected to obtain a cell extract.
- This cell extract was subjected to Western blot analysis.
- An anti-LC3B antibody (Sigma) was used as a primary antibody and reacted with the transfer membrane at 4 ° C. for 16 hours.
- the LC3 molecule was detected using a chemiluminescent reagent after reacting with an HRP-labeled secondary antibody. Whether autophagy was induced was evaluated by shifting LC3 to type I (18 kDa) and type II (16 kDa). From the results shown in FIG. 6, it can be seen that autophagy induced by GST- ⁇ knockdown was suppressed almost completely by simultaneously knocking down Akt.
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Abstract
Description
(1)GST-πを抑制する薬物と、Aktを抑制する薬物とを活性成分として含む、アポトーシスを誘導するための剤。
(2)GST-πを抑制する薬物と、Aktを抑制する薬物とを活性成分として含む、細胞増殖を抑制するための剤。
(3)Aktを抑制する薬物とを活性成分として含む、GST-πが抑制された細胞においてオートファジーを抑制するための剤。
(4)Aktを抑制する薬物とを活性成分として含む、GST-πを抑制する薬物によるアポトーシスの誘導および/または細胞増殖の抑制を増強するための剤。
(5)活性成分が、RNAi分子、リボザイム、アンチセンス核酸、DNA/RNAキメラポリヌクレオチドおよびこれらを発現するベクターからなる群から選択される、(1)~(4)のいずれかに記載の剤。
(6)(1)~(5)のいずれかに記載の剤を含む、医薬組成物。
(7)細胞の異常増殖に起因する疾患の治療用である、(6)に記載の医薬組成物。
(8)がんの治療用である、(6)に記載の医薬組成物。
本明細書で用いる場合、GST-πは、GSTP1遺伝子によりコードされる、グルタチオン抱合を触媒する酵素を指す。GST-πはヒトを含む種々の動物に存在し、その配列情報も公知である(例えば、ヒト:NP_000843(NM_000852)、ラット:NP_036709(NM_012577)、マウス:NP_038569(NM_013541)など。番号はNCBIデータベースのアクセッション番号を示し、括弧外はアミノ酸配列、括弧内は塩基配列の番号である)。
本明細書で用いる場合、DNA/RNAキメラポリヌクレオチドは、限定されずに、例えば、特開2003-219893に記載の、標的遺伝子の発現を阻害するDNAとRNAとからなる2本鎖ポリヌクレオチドを含む。
上記アポトーシス誘導または細胞増殖抑制方法はいずれも、in vitroの方法であっても、in vivoの方法であってもよい。また、当該方法における薬物については既に上述したとおりであり、薬物の有効量は、投与した細胞においてアポトーシスが誘導される、または細胞増殖が抑制される量であってもよい。また、投与による利益を超える悪影響が生じない量が好ましい。かかる量は公知であるか、培養細胞などを用いたin vitro試験などにより適宜決定することができ、このような試験法は当業者によく知られている。アポトーシスの誘導または細胞増殖の抑制は、上述のものを含む種々の既知の手法により評価することができる。上記有効量は、薬物をある細胞集団に投与した場合に、必ずしも同細胞集団の全ての細胞にアポトーシスまたは増殖抑制をもたらすものでなくともよい。例えば、上記有効量は、細胞集団における細胞の1%以上、2%以上、3%以上、4%以上、5%以上、6%以上、8%以上、10%以上、12%以上、15%以上、20%以上、さらには25%以上などにアポトーシスまたは増殖抑制をもたらす量であってよい。
上記製造方法または使用における薬物や配合量、アポトーシスに異常を有する疾患については、既に上述したとおりである。また、各薬物の配合は、既知の任意の手法に従って行うことができる。
本発明において、オートファジーの抑制は、本発明の剤または組成物を作用させなかった場合に比べ、細胞においてオートファジーが抑制されていることにより決定することができる。オートファジーの評価手法については、上述のとおりである。
本明細書で用いる場合、「GST-πが抑制された」とは、例えば、GST-πが発現している細胞において、GST-πが抑制されている状態を含む。かかる状態としては、例えば、GST-πが発現している細胞に、GST-πを抑制する薬物(例えば、上述のものなど)を投与した状態などが挙げられる。
ある細胞においてGST-πが発現しているか否かは、文献学的に知られているか、または、細胞におけるGST-πの発現を実際に検出することにより決定することができる。GST-πの発現は、既に上述したものを含む、既知の任意の手法を用いて検出することができる。
例えば、経口投与に適した剤形としては、限定することなく、散剤、顆粒剤、錠剤、カプセル剤、液剤、懸濁剤、乳剤、ゲル剤、シロップ剤などが挙げられ、また非経口投与に適した剤形としては、溶液性注射剤、懸濁性注射剤、乳濁性注射剤、用時調製型注射剤などの注射剤が挙げられる。非経口投与用製剤は、水性または非水性の等張性無菌溶液または懸濁液の形態であることができる。
投与経路としては、経口および非経口の両方を包含する種々の経路、例えば、経口、静脈内、筋肉内、皮下、局所、腫瘍内、直腸、動脈内、門脈内、心室内、経粘膜、経皮、鼻内、腹腔内、肺内および子宮内等の経路が含まれる。
投与頻度は、用いる剤や組成物の性状や、上記のものを含む対象の条件によって異なるが、例えば、1日多数回(すなわち1日2、3、4回または5回以上)、1日1回、数日毎(すなわち2、3、4、5、6、7日毎など)、1週間毎、数週間毎(すなわち2、3、4週間毎など)であってもよい。
また、用語「処置」は、本明細書で用いる場合、疾患の治癒、一時的寛解または予防などを目的とする医学的に許容される全ての種類の予防的および/または治療的介入を包含するものとする。例えば、「処置」の用語は、疾患の進行の遅延または停止、病変の退縮または消失、発症の予防または再発の防止などを含む、種々の目的の医学的に許容される介入を包含する。
例1:siRNAによるGST-πおよびAktのノックダウン
1×106個のPANC-1細胞を10cmシャーレに播種し、10%ウシ胎児血清(Fetal bovine serum、FBS)と5%L-グルタミンを添加したRoswell Park Memorial Institute 1640(RPMI 1640、Sigma社)で18時間培養した。培養条件は、特に別記しない限り37℃、5%CO2で行った。また、1×106個のA549細胞を10cmシャーレに播種し、10%FBSと10%L-グルタミンを添加したDulbecco’s modified Eagle’s medium(DMEM、Sigma社)で18時間培養した。培地をそれぞれ交換し、2時間後、20~30%コンフルエントになったPANC-1またはA549細胞にLipofectamine RNAiMAX(Life Technologies社)を用いて、GST-π siRNAおよび/またはAkt siRNAをトランスフェクションした。
GST-π siRNA:
センス鎖:GGGAGGCAAGACCUUCAUUtt(配列番号1)
アンチセンス鎖:AAUGAAGGUCUUGCCUCCCtg(配列番号2)
(なお大文字はRNA、小文字はDNAをそれぞれ意味する)
Akt siRNA:Akt siRNA I(Cell Signaling Technology社、#6211)
Control siRNA:AllStars Neg. Control siRNA 1027281(QIAGEN社)
Akt阻害剤としてsiRNA以外の物質を用いても同様の結果が得られることを、小分子であるAkt Inhibitor VIII(Merck #124018、1,3-Dihydro-1-(1-((4-(6-phenyl-1H-imidazo[4,5-g]quinoxalin-7-yl)phenyl)methyl)-4-piperidinyl)-2H-benzimidazol-2-one)を使用して検討した。なお、Akt Inhibitor VIIIは、AktのPleckstrin homology(PH)領域に結合してアロステリック阻害をもらたし、Akt3は阻害しないが、Akt1およびAkt2のリン酸化と活性化を選択的にブロックすることが知られている(Barnett, S.F., et al. 2005. Biochem. J. 385: 399-408、Lindsley, C.W., et al. 2005. Bioorg. Med. Chem. Lett. 15: 761-764、Zhao, Z., et al. 2005. Bioorg. Med. Chem. Lett. 15: 905-909)。
センス鎖:CGAUUCGCUAGACCGGCUUCAUUGCAG(配列番号3)
アンチセンス鎖:GCAAUGAAGCCGGUCUAGCGAAUCGAU(配列番号4)
これらの細胞をトリプシン処理で10cmシャーレから剥離、採取し、6cmシャーレに1×105個ずつ播種し直し、Akt Inhibitor VIIIを1μMの終濃度で添加した。その後、24時間毎に、細胞をトリプシン処理でシャーレから剥離、採取し、細胞数をカウントした。検定にはBonferroni/Dunn法を用いた。結果を図5に示す。この結果から、Akt阻害剤としてsiRNA以外の物質を用いても、GST-πとAktの両方の阻害により、GST-πおよびAktのいずれか一方を阻害した場合に比べ、細胞増殖抑制効果が増大することが分かる。
GST-πおよびAktのダブルノックダウンによりオートファジーがどのような影響を受けるかを検討した。
1×106個のPANC-1細胞を10cmシャーレに播種し、10%FBSと5%L-グルタミンを添加したRPMI 1640で24時間培養した。培地を10mLのOPTI-MEMに置換し、例1と同様に調製したGST-π siRNA、Akt siRNA、またはGST-π siRNAとAkt siRNAとの混合溶液を、各siRNAが10nMの終濃度となるようにシャーレに添加し、室温で5時間培養後、培地を5%FBS加RPMI 1640に置換し、3日間培養した。シャーレの細胞を氷冷PBSで洗った後、氷冷Lysis bufferを加え、細胞を破砕した。Lysis bufferはNP-40 Alternative, PROTEIN GRADE(R) Detergent, 10% Solution, Sterile-Filtered(CALBIOCHEM社)100μL、1M Tris-HCl(pH7.5)500μL、5M NaCl300μL、0.5M EDTA20μL、滅菌水9.08μLを混和して調製した。細胞破砕液をセルスクレイパーで集め、30分氷冷した。この間10分おきに転倒混和した。得られた溶液を15000rpm、4℃で15分遠心し、上清を採取し、細胞抽出液とした。この細胞抽出液をウェスタンブロット解析に供した。一次抗体として、抗LC3B抗体(Sigma社)を用いて、転写膜と4℃、16時間反応させた。LC3分子の検出は、HRP標識二次抗体と反応させた後、化学発光試薬を用いて行った。オートファジーが誘導されているかどうかは、LC3のI型(18kDa)とII型(16kDa)への移行で評価した。
図6に示す結果から、GST-πのノックダウンにより誘導されたオートファジーが、Aktを同時にノックダウンすることによりほぼ完全に抑制されたことが分かる。
Claims (8)
- GST-πを抑制する薬物と、Aktを抑制する薬物とを活性成分として含む、アポトーシスを誘導するための剤。
- GST-πを抑制する薬物と、Aktを抑制する薬物とを活性成分として含む、細胞増殖を抑制するための剤。
- Aktを抑制する薬物とを活性成分として含む、GST-πが抑制された細胞においてオートファジーを抑制するための剤。
- Aktを抑制する薬物とを活性成分として含む、GST-πを抑制する薬物によるアポトーシスの誘導および/または細胞増殖の抑制を増強するための剤。
- 活性成分が、RNAi分子、リボザイム、アンチセンス核酸、DNA/RNAキメラポリヌクレオチドおよびこれらを発現するベクターからなる群から選択される、請求項1~4のいずれか一項に記載の剤。
- 請求項1~5のいずれかに記載の剤を含む、医薬組成物。
- 細胞の異常増殖に起因する疾患の治療用である、請求項6に記載の医薬組成物。
- がんの治療用である、請求項6に記載の医薬組成物。
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BR112015014842A BR112015014842A2 (pt) | 2012-12-20 | 2013-12-20 | agente de indução de apoptose |
CA2895690A CA2895690C (en) | 2012-12-20 | 2013-12-20 | Apoptosis-inducing agent comprising suppressors of gst-.pi. and akt |
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US20150328248A1 (en) | 2015-11-19 |
TW201440788A (zh) | 2014-11-01 |
JP6340162B2 (ja) | 2018-06-06 |
EP2937099A1 (en) | 2015-10-28 |
JP2014122175A (ja) | 2014-07-03 |
US9914983B2 (en) | 2018-03-13 |
CA2895690A1 (en) | 2014-06-26 |
RU2015129287A (ru) | 2017-01-25 |
EP2937099A4 (en) | 2016-07-27 |
CN104884090A (zh) | 2015-09-02 |
AU2013364893A1 (en) | 2015-07-09 |
BR112015014842A2 (pt) | 2017-07-11 |
KR20150095780A (ko) | 2015-08-21 |
CA2895690C (en) | 2021-08-10 |
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